<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
#div1{width:200px; height:200px; background:red; position:absolute;}
.box{border:1px dashed black; position:absolute;}
</style>
<script>
window.onload=function(event)
{
	var oDiv=document.getElementById('div1');
	
	var disX=0;
	var disY=0;
	oDiv.onmousedown=function(event)
	{
		disX=event.clientX-oDiv.offsetLeft;
		disY=event.clientY-oDiv.offsetTop;
		
		var oBox=document.createElement('div');
		
		oBox.className='box';
		oBox.style.width=oDiv.offsetWidth+'px';
		oBox.style.height=oDiv.offsetHeight+'px';
		oBox.style.left=oDiv.offsetLeft+'px';
		oBox.style.top=oDiv.offsetTop+'px';
		document.body.appendChild(oBox);
		
		document.onmousemove=function(event)
		{
			var l=event.clientX-disX;
			var t=event.clientY-disY;
			
			
			oBox.style.left=l+'px';
			oBox.style.top=t+'px';
		}
		document.onmouseup=function()
		{
			document.onmousemove=null;
			document.onmouseup=null;
			
			oDiv.style.left=oBox.offsetLeft+'px';
			oDiv.style.top=oBox.offsetTop+'px';
			
			document.body.removeChild(oBox);
		}
		return false;
	}
	
	
};
</script>
</head>

<body>
<div id="div1"></div>
</body>
</html>

